I don't have one but looked at them deeply before carrying on with the army options and what folk were saying was ..............
Snugpaks are good, though perhaps not quite as good as their published temperature ratings suggest.
They tend to be a snug fit compared to army bags. They do though sell a panel that zips in and makes them a little larger at the top.
Of course if you want to lose bulk then you should be thinking about a Down bag. Bigger money and don't work when wet, but pack tiny and weigh sod all.
I stayed with the army bags because I am tight and they are tough.
